Air sterilizer



FIG. 1 is a perspective view of an air sterilizer

FIG. 2 is a front view thereof

FIG. 3 is a rear view thereof

FIG. 4 is a left side view thereof

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top plan view thereof.

The broken line showing of the air sterilizer in FIGS. 3-6 is for the purpose of illustration and forms no part of the claimed design. 

I claim the ornamental design for an air sterilizer, as shown and described. 